Labrisomus jenkinsi — Details

Jenkins' Blenny learn more about names for this taxon

Overview

Comprehensive Description

Description

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Common names: blenny (English), trambollo (Espanol)
 
Labrisomus jenkinsi (Heller & Snodgrass, 1903)


Jenkins' blenny


Body robust; head broad, snout blunt; eye large; nostrils with cirri; a branched cirrus over each eye; heavily branched cirri on each side of nape; mouth large, slightly oblique, top rear jawbone exposed, not in a sheath; roof of mouth - teeth at sides larger than those at center front;  dorsal fin XVIII-XIX, 10-11, notched between spines and rays; anal rays II, 17; pectoral rays 14-15; 3 pelvic soft rays; 58-62 lateral line scales; head scaleless, except for a few scales along top edge of gill cover.

Mottled greenish brown with 5-6 diffuse blackish bars on side, also 2 rows of white spots may be present on side and white streak at midbase of caudal fin; ocellus often present at front of dorsal fin; head with numerous dark spots, bands, or broken lines; nuptial males  lack strong mottling on side and have an orange head.




Size: to at least 13 cm.

Habitat: infrequently encountered in rocky shallows.

Depth: 1-5 m.

Galapagos Islands.

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Biology

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Sometimes encountered in shallow rocky areas. Feeds on invertebrates.
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Distribution

Range Description

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This species is endemic to the Eastern Pacific, and is found only in the Galápagos Islands.
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Depth

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Depth Range (m): 1 (S) - 5 (S)
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Zoogeography

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See Map (including site records) of Distribution in the Tropical Eastern Pacific


 
Global Endemism: All species, East Pacific endemic, Tropical Eastern Pacific (TEP) endemic

Regional Endemism: All species, TEP endemic, TEP oceanic island (s) endemic, Galapagos Islands endemic, Island (s), Island (s) only

Residency: Resident

Climate Zone: Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)

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Southeast Pacific: Galapagos Islands.
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Physical Description

Morphology

Size

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Length max (cm): 13.0 (S)
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Size

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Maximum size: 130 mm NG
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Max. size

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13.0 cm TL (male/unsexed; (Ref. 11482))
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Ecology

Habitat

Habitat and Ecology

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Habitat and Ecology
This benthic, reef-associated species is infrequently encountered in rocky shallows to depths of five m.

Systems
  • Marine
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Depth range based on 1 specimen in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 1.5 - 1.5
  Temperature range (°C): 23.233 - 23.233
  Nitrate (umol/L): 4.634 - 4.634
  Salinity (PPS): 34.347 - 34.347
  Oxygen (ml/l): 4.635 - 4.635
  Phosphate (umol/l): 0.643 - 0.643
  Silicate (umol/l): 4.346 - 4.346
 
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Habitat

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Salinity: Marine, Marine Only

Inshore/Offshore: Inshore, Inshore Only

Water Column Position: Bottom, Bottom only

Habitat: Reef (rock &/or coral), Reef only, Rocks, Reef associated (reef + edges-water column & soft bottom)

FishBase Habitat: Demersal
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Environment

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demersal; marine
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Trophic Strategy

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Sometimes encountered in shallow rocky areas. Feeds on invertebrates.
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Feeding

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Feeding Group: Carnivore

Diet: mobile benthic worms, mobile benthic crustacea (shrimps/crabs), mobile benthic gastropods/bivalves, sea-stars/cucumbers/urchins
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Life History and Behavior

Reproduction

Reproduction

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Egg Type: Benthic, Pelagic larva
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Conservation

Conservation Status

IUCN Red List Assessment

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Red List Category
VU
Vulnerable

Red List Criteria
D2

Version
3.1

Year Assessed
2010

Assessor/s
Hastings, P., Dominici-Arosemena, A.

Reviewer/s
Carpenter, K., Polidoro, B., Livingstone, S. (Global Marine Species Assessment Team)

Contributor/s

Justification
This species is only known from one location (Galápagos Islands). Regional experts support the plausible threat of the increased duration and frequency of ENSO events that can cause severe and rapid declines for restricted-range, shallow-water species in this region of the Eastern Tropical Pacific. This species is listed as Vulnerable under Criterion D2.
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Conservation status

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IUCN Red List: Not evaluated / Listed

CITES: Not listed
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Population

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Population
There is no population information available for this species.

Population Trend
Unknown
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Threats

Threats

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Major Threats
In the Eastern Tropical Pacific, severe localized fish species declines have occurred after strong ENSO events that result in shallow waters that are too warm and nutrient poor for extended periods of time (Grove 1985, Guzmán and Cortés 1992, Edgar et al. 2009). The frequency and duration of ENSO events in this region of the Eastern Tropical Pacific (e.g. the up-welling zone off the coast of Peru, Ecuador, Colombia, Panama, Costa Rica and the offshore islands) appears to be increasing (Glynn and Ault 2000, Soto 2001, Chen et al. 2004). Given this species’ restricted distribution and shallow water habitat, oceanographic environmental changes, such as those associated with future ENSO events, may have detrimental effects on the survival of this species.
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Vulnerable (VU) (D2)
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Management

Conservation Actions

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Conservation Actions
There are no known conservation measures for this species. However, this species distribution falls with the Galápagos Islands National Park and UNESCO World Heritage Site (WDPA 2006).
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Wikipedia

Labrisomus jenkinsi

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Labrisomus jenkinsi, known commonly as the Jenkin's blenny, is a species of labrisomid blenny.[1]

References

  1. ^ Labrisomus jenkinsi at www.fishbase.org.
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